Die-stock.



BECKER,

DIE STOCK.

APPLICATION FILED JAN.S1,1913. 1,,@62,3 l T, Patented May 20, 1913. 14 a 8 7 14 1 15 15 15 .15 16' 1/615 r er 1 WATENT :OFFICFEQ PAUL sscx'fsnor narnen ron'r, oouunc'rrcur, assreuoa TO" THE HANDY ammo rao'runme oommuxjor sarnesronzr, CONNECTICUT, AooaPonATIoN or con uscmour. i

. DIE-STOCK! Specification of Iietterjs Batenti Patented Ditty 20, 1913.

' Appli cationfiled January 31-. 1913. Serial No. 745,461., I

" To all whom-it may) concern Be it known" that 1, PAUL E3 BnoKER, citizen of the United States, residing'in'the city of Bridgeport, county of Fairfield, State 5- of Connecticut, have invented certain new and useful Improvements in'Die-Stocks; and I do declar'e'the following to be a full,'-clear,

' and exact description of the invention, suchaswill enable others skilled inthe art to which itfappertains tomake and use'the' same; jw v My invention relates to certain'new and useful improvements'in die stocks, but more particularly has reference to devices of this '15 description in which means are employed for automaticallycontrolling the dies so that a they will cut a tapered thread. A I The object of'my improvement. is .to provide simple and efiicient means for control ling,the movement of the dies, and to avoid the use of cams in connection with the tapered element that immediately controls the radial movements of the 'dies.

WVith these ends in view-my invention con sists in certain detailsflof constructionand combination of parts hereinafter fully described and then particularly pointed out in the claims which concludethis description; Diestocks of this description usuallycomprise a stationary work holder and a rotary die carrying head movably arranged wlth respect to such holder, so that during the operation of the device the die carrying head gradually approaches orreced-es from .the work holder. .It has been'customary to pro vide the die ,carryinghead with a lead screw which is'enga ed with a thread cut on the work holder so that the die carrying head is positively caused to approach or recede- 40 from the work holder. Also, in machine for cutting threads, such lead screw has been eliminated, and the, die "carrying head vhas been so supported and guided by the work 1 holder that such head is capable of free and unobstructed movements towardand away from the work holder, and the dies themselves have been soconstructedfthat they will lead themselves on to the work'in ad# I ends of which the dies abut, these screws bevanoeof the-desired threading operation. '.*My improvement has nothing to do w1th any particular style of die stock and may be utilized with" or withouta lead screw and is not limited tothe use of any special nattireof cutting dies.

. accompanying, drawing figure stock-Fig. '2; a front elevation tl1ereofl Fig.3 a detail sectional elevation 1 showing modification of my invention with respect to the receding surfaces of the levers.

. parts in the sev eraflp'figures of thefdrawing.

lie the d-ie'carrying head or'body which is preferably provided with a lead screw extension 2, and 3 is the'work holder which is preferably provided with-a circular in latter the lead screw 2 engages. The work holder is'very ordinary in construction and istubu'lar so that the pipe or'other work to be threaded may be passed'through it and secured byany suitable means such asclainp' mg screws '5. v

6 are the thread cutting dies which are radially disposed on the outside of the head 1 and guided within housings 17 rigid with said head, these dies beingzc'apable of free inward and outward movements. The dies are retained as against displacementby ordinary cover platesS-se'cured to the housings.

9 are levers which are pivoted to the head 1 in planes which are at the rear of the outer ends, of the dies and onthe inner edges of these levers are inclines 10 which'are engaged' by a circular element supported by the work holder4, this element being in the form of a ringl l whose face is compara- "capableof independent rotation,- and retained as against lateral movement by means of a shouldered portion 12 formedon the work holder and a nut 13 driven onthe work 'hold'en- At Fig. v1 I have shown theselevers provided withportions 14 that'extend'up wardly beyond the pivotal points f the levers, and through these portions adjusting'sc'rews 15 are driven against the inner ing secured in any suitable adjustment by means of lock nuts 16.

17 are sockets preferably integral. with the "head 1", within which sockets suitable handles 18-may be placed for thepurpose-of conven-- ,iently revolving the "head by hand.

is a sectional elevation of myimprovedfdie f Similar numerals of reference denote-like teriorly threaded extension 4; with which.

tively narrow with-respect to the length of a modificationof my invention so far as adjustable abut-ments between the dies and. levers are concerned, and Fig.4 is-a'detail- I sectional elevation illustrating-a. further As the die carrying head is revolved for the purpose of cans g the dies to perform their functions, such head will gradually approach the work holder and the inclines 10 are ofsuch a nature that, as they travel across the surface of the ring 11 during this .movement of the die carrying head, the

lower parts of these levers below their pivotal points will be forced inwardly and kept in constant contact with the surface of the ring 11, owing to the fact that the threading' dies are in abutment wit-h the ends of the adjusting screws 15 and are constantly receding from the work as different parts of these inclines successlvely travel across the surface of thering 11. Since the ring 11 isquite narrow and has no function what-. ever except that of a mere passive contact-- ing shoulder or protuberance, the inc-lines 10 will have only a limited contact against said ring, and, as the die carrying head 1 moves toward oraway from the work-carrier, different portions of said inclineswill be brought successively into. and out of con-- tact with this ring 11, andtherefore the friction or bearing area between said inclines and ring 11 wlll be minimized. Therefore, 1t

will be clearly understood, that, as the lower dies, butthat the latter will receive an endthrust during their operation on the work therefore .do not wish to be llmited in this portions of these levers swing inwardly, the surfaces in contact with the rear of the times will have a tendency .to recede from the which will cause them to follow up these receding movements and always contact with the receding surfaces carried by these levers.

Of course the dies may abut directly against the levers without any intervening adjustable abutments whatsoever, and I respect, but I prefer to employ such abutments since the dies can thereby be adjusted to cut tapered threads on several sizes of work.

Referring more particularly to Fig. 2 1t will be noted-that the dies are provided with a scale marked 1, 1%", 111;, 2", and that the cover plates are marked with index llnes denoted by the letter S, which signifies that these dies may be adjusted normally so that they will cut tapered threads on work rang,- ing from 1 to 2 inv diameter, the dies 1n the instance shown being adjusted to cut threads on 2" work.

Instead of equipping the levers with the adjustable abutments, the latter may .be carfied by the dies themselves, as is lllustrated at Fig. 3, where one .of the dies is shown with an adjusting screw 19 driven therein,

Also, it is not necessary that the levers should be provided with the upward extensions 14: in order to provide for receding con-" tact surfaces, since such I levers may be formed with inclined contact surfaces ata point below the axis of the pivots of these levers, as is shown at" Fig. 4 where one of the levers is illustrated as provided with an inclined surface 20 againstwhich an adjusting screw 21 carried by the die abuts,

and it will be readily understood that as the lower portion of this lever swings inwardly this incline 20 will be elevated thus permitlting the gradual receding movement of the die. To be more explicit, still referring to Fig. 4 ,"it will be clear, that the inclines 10 are so slight thatthe lower extremities of the levers 9 will have only a slight swinging movement, which is in reality about onesixteenth of an inch, since'the actual taper of the thread is quite slight, and therefore the upper ends of these levers will have a still: slighter movement; accordingly, as the 1n cl1nes 10 travel across the contact surfaces of the ring 11 during the thread cutting operation of thedies the inclined portion 20 will be'slightly raised away from the end of the abutment 21 carried by the dies, but

the. end thrust of the dies themselves will cause such abutment to follow up the incline 20 so as to be constantly in contact therewith ,as saidincline is gradually elevated.

It will now be clear that there are no cams whatsoever utilized in carrying out my improvement, and that the contacting surface of the ring 11, is perfectly plain and is pas-' sive in its cooperation with the inclined portions 10.

I preferably provide recessed portions 22 at the ends .ofthe inclines 10, so that when said portions come opposite the ring 11 the levers may swing so as to withdraw the dies completely from the thread that has been out, thus enabling the work to be removed without the necessity of backing the dies off I holder, thread cutting dies s'lidably carried by said head, levers pivoted to said'head and 0 .havlng surfaces which recede as the dles perform their functions against which surfaces said diesabut,said levers ha'vingextensions which are provided withinclines on their inner edges, and an annular element having a minimized contact with said inclines which contact is constant owing to the thrust of the dies against such levers during the thread cutting operation.

2. A die stock, comprising a' work holder, 'a die carrying head supported by andmovablvguided t'owafd and away from said holder, thread cutting dies slidably carried by said head, levers pivoted to said head piv0tal points which extensions are provided with inclines on their inner edges, and a, comparet vely narrow annular protuberance carr edby the Work holder and stationary as to lateral movement, with which protuberance difierent portions of said inclines are successively brought into minimikedcontact during inward 01" out-Ward 15 movement-,0)? the die carrying head.

In testimony whereof I afiix my signature in preseiibe of two Witnesses.

PAUL E. BECKER. Witnesses: 

